| 1 | /**************************************** |
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| 2 | * Computer Algebra System SINGULAR * |
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| 3 | ****************************************/ |
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| 4 | /* $Id: mmheap.c,v 1.2 1997-04-02 15:07:32 Singular Exp $ */ |
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| 5 | |
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| 6 | /* |
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| 7 | * ABSTRACT: |
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| 8 | */ |
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| 9 | |
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| 10 | #define _POSIX_SOURCE 1 |
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| 11 | |
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| 12 | #include <stdlib.h> |
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| 13 | #include "mod2.h" |
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| 14 | #include "febase.h" |
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| 15 | #include "mmemory.h" |
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| 16 | #include "mmprivat.h" |
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| 17 | |
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| 18 | static char * mm_theHeapPtr = NULL; |
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| 19 | static char * mm_tmpHeapPtr = NULL; |
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| 20 | static char * mm_normHeapPtr = NULL; |
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| 21 | |
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| 22 | static int mm_theBytesLeft = 0; |
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| 23 | static int mm_tmpBytesLeft = 0; |
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| 24 | static int mm_normBytesLeft = 0; |
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| 25 | |
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| 26 | static status_t mm_heapStatus = MM_NORMAL; |
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| 27 | |
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| 28 | static void mmDistributeRestOfHeap( void ); |
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| 29 | |
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| 30 | void* mmGetMemory( size_t size ) |
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| 31 | { |
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| 32 | void * dummy; |
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| 33 | |
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| 34 | if ( mm_theBytesLeft < size ) { |
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| 35 | mmDistributeRestOfHeap(); |
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| 36 | mm_theHeapPtr = (char*)mmGetBlock(); |
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| 37 | mm_theBytesLeft = MAXDATA; |
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| 38 | } |
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| 39 | dummy = (void*)mm_theHeapPtr; |
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| 40 | mm_theBytesLeft -= size; |
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| 41 | mm_theHeapPtr += size; |
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| 42 | return dummy; |
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| 43 | } |
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| 44 | |
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| 45 | BOOLEAN mmPutMemory( void *adr, size_t size ) |
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| 46 | { |
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| 47 | void * dummy=(void *)((char *)adr+size); |
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| 48 | |
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| 49 | if ( dummy == mm_theHeapPtr) |
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| 50 | { |
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| 51 | mm_theHeapPtr=(char *)adr; |
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| 52 | mm_theBytesLeft += size; |
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| 53 | return TRUE; |
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| 54 | } |
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| 55 | return FALSE; |
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| 56 | } |
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| 57 | |
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| 58 | #ifndef MDEBUG |
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| 59 | |
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| 60 | static void mmDistributeRestOfHeap( void ) |
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| 61 | { |
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| 62 | /* |
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| 63 | * char* dummy; |
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| 64 | * int j; |
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| 65 | * |
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| 66 | * while ( mm_theBytesLeft > RealSizeFromSize( mmGetSize( 0 ) ) ) { |
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| 67 | * j = mmGetIndex( SizeFromRealSize( mm_theBytesLeft ) ); |
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| 68 | * if ( RealSizeFromSize( mmGetSize( j ) ) > mm_theBytesLeft ) j--; |
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| 69 | * dummy = mm_theHeapPtr; |
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| 70 | * mm_theHeapPtr += RealSizeFromSize( mmGetSize( j ) ); |
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| 71 | * mm_theBytesLeft -= RealSizeFromSize( mmGetSize( j ) ); |
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| 72 | * mmFreeBlock( &(dummy[DebugOffsetFront]), mmGetSize( j ) ); |
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| 73 | * } |
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| 74 | */ |
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| 75 | } |
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| 76 | |
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| 77 | #else /* MDEBUG */ |
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| 78 | |
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| 79 | static void mmDistributeRestOfHeap( void ) |
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| 80 | { |
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| 81 | /* |
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| 82 | * void* dummy; |
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| 83 | * int j; |
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| 84 | * |
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| 85 | * while ( mm_theBytesLeft > RealSizeFromSize( mmGetSize( 0 ) ) ) { |
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| 86 | * j = mmGetIndex( SizeFromRealSize( mm_theBytesLeft ) ); |
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| 87 | * if ( RealSizeFromSize( mmGetSize( j ) ) > mm_theBytesLeft ) j--; |
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| 88 | * dummy = mmAllocBlock( mmGetSize( j ) ); |
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| 89 | * mmFreeBlock( &dummy, mmGetSize( j ) ); |
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| 90 | * } |
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| 91 | */ |
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| 92 | } |
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| 93 | |
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| 94 | #endif /* MDEBUG */ |
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